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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65ff6975de49871d1c3606709121357ff1572546f4cd62c458a1f9acbcc64a51' 
  AND token = 'AknkaktwT5ajLBoy/zC2pEKjuxsPk/FSOMzplVfGbCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}